Himalayan glaciers could lose 80% of volume if global warming is not controlled, study finds
BENGALURU, India — Glaciers are melting at unprecedented rates across the Hindu Kush Himalayan mountain range and could lose up to 80% of their volume this century if greenhouse gas emissions aren’t sharply reduced, according to a new report.
The report Tuesday from the Kathmandu, Nepal-based International Centre for Integrated Mountain Development warned that flash floods and avalanches would be more likely in coming years and that there will be less fresh water for nearly 2 billion people who live downstream of 12 rivers that originate in the mountains. Ice and snow in the Hindu Kush are an important source of water for those rivers, which flow through 16 countries in Asia. They provide fresh water to 240 million people in the mountains and 1.65 billion downstream.
“The people living in these mountains who have contributed next to nothing to global warming are at high risk due to climate change,†said Amina Maharjan, a migration specialist and one of the report’s authors. “Current adaptation efforts are wholly insufficient, and we are extremely concerned that without greater support, these communities will be unable to cope.â€
The world’s glaciers are shrinking and disappearing faster than scientists thought, but limiting global warming by even a little would help save them.
Earlier reports have found that the cryosphere — regions on Earth covered by snow and ice — are among the most affected by climate change. Recent research found that Mount Everest’s glaciers, for example, have lost 2,000 years of ice in just the last 30 years.
“We map out for the first time the linkages between cryosphere change with water, ecosystems and society in this mountain region,†Maharjan said.
Among the key findings from Tuesday’s report are that the Himalayan glaciers have disappeared 65% faster since 2010 than in the previous decade, and reducing snow cover due to global warming will result in reduced fresh water for people living downstream. The study found that 200 glacier lakes across the mountains are deemed dangerous, and the region could see a significant spike in glacial lake outburst floods by the end of the century.
Scientists now fear increasingly warmer water in daily tides are doing much more damage to one of Greenland’s glaciers than they thought.
The study found that communities in the mountain regions are being affected by climate change far more than those in many other parts of the world. It says changes to the glaciers, snow and permafrost of the Hindu Kush Himalayan region driven by global warming are “unprecedented and largely irreversible.â€
Himalayan communities are already feeling the effects of climate change. Earlier this year, the Indian mountain town of Joshimath began sinking, and residents had to be relocated within days.
“Once ice melts in these regions, it’s very difficult to put it back to its frozen form,†said Pam Pearson, director of the International Cryosphere Climate Initiative, who was not involved with the report. “It’s like a big ship in the ocean. Once the ice starts going, it’s very hard to stop. So, with glaciers, especially the big glaciers in the Himalayas, once they start losing mass, that’s going to continue for a really long time before it can stabilize.â€
Pearson said that for the Earth’s snow, permafrost and ice, it is important to limit warming to the 1.5 degrees Celsius agreed upon at the 2015 Paris climate conference.
“I get the sense that most policymakers don’t take the goal seriously, but in the cryosphere, irreversible changes are already happening,†she said.
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